Question

Fish swims in water with the help of its
A. Scales
B. Streamlined body
C. Fins
D. Both b and c

Answer 1

Hint: Fish is an aquatic animal belonging to animalia chordata. It has no limbs. It has a thin vertebral column. Its fins are not attached to columns, instead they have muscular attachment.

Complete answer:
Fish are aquatic animals. They belong to animalia. They do not have any limbs. They bear grylls. They have notochords as a replacement of true spine. Fishes are cold blooded animals. Their body temperature can adjust according to the zones of the water. They use acoustic communication to talk underwater with the other fishes. This communication stimulus varies between the species. Fish has three main parts — head, trunk and tail. The support structure is entirely made up of cartilage. The essential component is the light weight vertebral column. Fish have no limbs. Fins are the external feature connected to the trunk. These can be soft or bony. The fish’s heart is a 2 chambered heart.
Option A. Scales — scales are seen on the dermis of cartilaginous fishes. These help the fish in self defence as these protect them from predators in the water. It reduces its body friction in the body. It also provides additional flexibility
Option B. streamlined body — fish fins help then to swim. The streamlined body helps it to have a correct orientation while swimming.
Option C. fins— fins are external features attached to the trunk. These can be soft or bony. These help the fish to swim
Option D. both b and c. This is the correct answer as fins and streamlined bodies both help to move in water.

So the correct answer is option D- Both B and C.

Note:
Fish can communicate with other fishes in the water through acoustic streaming. It is a cold blooded animal with a two chambered heart. Its eyes have the capability to see in the water i.e it has local vision.